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Are you SURE your engine is not getting appropriately warm?
Is your fuel gauge showing less fuel than you really have?
If this is the case look at the voltage regulator on the
back of your dash panel that controls both the temp and gas
gauge. May be you engine is OK but your temp gauge is not
showing it.
Otherwise you probably do have a thermostat not closing. It is
the thermostat that controls the actual temp at which the
cooling system operates. Any problem in the cooling system
will cause the ACTUAL (not indicated, necessarily) temp to go up.
Too much antifreeze will increase the freezing point from a minimum
of 68 below zero (F) for 2/3 antifreeze to 1/3 water to about
zero for 100% antifreeze.
If the weather is cold one problem is that frequently the thermostat
opens and closes rather suddenly so in very cold weather you have
a surge of very cold water in a warm engine, which is not good all
the way around but can especially be felt in your heater. That is
why the 444 and 544 as well as some of the earlier 122s had the
funky roller blind on a chain in front of the radiator. When it
gets cold again here I plan to put a piece of cardboard in front
of the radiators of both my 122 and my 164, to cover about 2/3 of the
radiator in each case. Keep it in till engine temps are no longer
controlled by the thermostat (and they start to rise a little higher
than normal) and then I'll take 'em out.
Normally a bad gauge voltage regulator will cause it to show hotter
than it is, however.
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